$vmSet = get-vm | select name,vmhost,clusterpreferredowner
foreach ($vm in $vmSet) {
    if (-not $vm.clusterPreferredOwner) {
        write-host "VM has no preferred owner: "$vm.Name
    }
    else {
        if ($vm.vmhost -ne $vm.clusterPreferredOwner[0]) {
            write-host $vm.Name", "$vm.vmhost", "$vm.clusterpreferredowner
        }
    }
}